Problem 38
Consider the reaction \(\mathrm{CaCO}_{3}(\mathrm{~s}) \rightleftharpoons \mathrm{CaO}(\mathrm{s})+\) \(\mathrm{CO}_{2}(\mathrm{~g})\) in a closed container at equilibrium. At a fixed temperature what will be the effect of adding more \(\mathrm{CaCO}_{3}\) on the equilibrium concentration of \(\mathrm{CO}_{2} ?\) (1) it increases (2) it decreases (3) it remains same (4) cannot be predicted unless the values of \(K_{p}\) is known
Problem 41
If the cquilibrium constants of the following cquilibrium \(\mathrm{SO}_{3} \rightleftharpoons \mathrm{SO}_{2}+\mathrm{O}_{2}\) and \(\mathrm{SO}_{2} \mid \mathrm{O}_{2} \rightleftharpoons \mathrm{SO}_{3}\) are given by \(\mathrm{K}_{\mathrm{l}}\) and \(\mathrm{K}_{2}\), respectively, which relation is corrcct? (1) \(\mathrm{K}_{1}=\left(1 / \mathrm{K}_{2}\right)^{2}\) (2) \(\mathrm{K}_{2}=\left|1 / \mathrm{K}_{\mathrm{l}}\right|^{2}\) (3) \(K_{1}=1 / K_{2}\) (4) \(\mathrm{K}_{1}=\left(\mathrm{K}_{2}\right)^{2}\)
Problem 42
Which of the following will have nearly equal \(\mathrm{H}^{-}\) concentration? (a) \(100 \mathrm{ml} 0.1 \mathrm{M}\) HCl mixed with \(50 \mathrm{ml}\) water (b) \(50 \mathrm{ml} 0.1 \mathrm{M} \mathrm{II}_{2} \mathrm{SO}_{4}\) mixed with \(50 \mathrm{ml}\) water (c) \(50 \mathrm{ml} 0.1 \mathrm{M} \mathrm{II}_{2} \mathrm{SO}_{4}\) mixed with \(100 \mathrm{ml}\) water (d) \(50 \mathrm{ml} 0.1 \mathrm{M}\) IICl mixcd with \(50 \mathrm{ml}\) watcr (1) a, b (2) \(\mathrm{b}, \mathrm{c}\) (3) \(\mathrm{a}, \mathrm{c}\) (4) \(\mathrm{c}, \mathrm{d}\)
Problem 43
The ionic product of water is defined as (1) The product of the concentration of proton and hydroxyl ion in pure water (2) The product of the concentration of acid and hydroxyl ion in aqueous solution (3) The ratio of the concentration of dissociated water to the undissociated water (4) All the above
Problem 43
When \(\mathrm{CaCO}_{3}\) is heated at a constant temperature in a closed container, the pressure due to \(\mathrm{CO}_{2}\) produced will (1) change with the amount of \(\mathrm{CaCO}_{3}\) taken (2) change with the size of the container (3) remain constant so long as the temperature is constant (4) remain constant even if the temperature is changea
Problem 44
For the chemical reaction \(3 \mathrm{X}(\mathrm{g})+\mathrm{Y}(\mathrm{g}) \rightleftharpoons \mathrm{X}_{3} \mathrm{Y}(\mathrm{g})\) the amount of \(\mathrm{X}_{3} \mathrm{Y}\) at equilibrium is affected by (1) Tempcrature and pressure (2) Tempcrature only (3) Pressurc only (4) Temperature, pressure and catalyst
Problem 45
At \(1000^{\circ} \mathrm{C}\), the equilibrium constant for the reaction of the system \(2 \mathrm{II}_{2}(\mathrm{~g}) \mathrm{O}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{II}_{2} \mathrm{O}(\mathrm{g})\) is very largc. This implics that (1) \(\mathrm{II}_{2} \mathrm{O}(\mathrm{g})\) is unstable at \(1000^{\circ} \mathrm{C}\) (2) \(\mathrm{II}_{2}(\mathrm{~g})\) is unstable at \(1000^{\circ} \mathrm{C}\) (3) \(\mathrm{II}_{2}\) and \(\mathrm{O}_{2}\) have very little tendency to combinc at \(1000^{\circ} \mathrm{C}\) (4) \(\mathrm{II}_{2} \mathrm{O}(\mathrm{g})\) has very little tendency to decompose into \(\mathrm{II}_{2}(\mathrm{~g})\) and \(\mathrm{O}_{2}(\mathrm{~g})\) at \(1000^{\circ} \mathrm{C}\)
Problem 45
The hydrogen ion concentration in a solution of weak acid of dissociation constant \(K_{a}\) and concentration \(C\) is nearly equal to (1) \(\sqrt{\frac{K_{\mathrm{u}}}{C}}\) (2) \(\frac{C}{K_{\mathrm{a}}}\) (3) \(K_{\mathrm{a}} \cdot C\) (4) \(\sqrt{K_{\mathrm{a}} \cdot \mathrm{C}}\)
Problem 46
The equilibrium constant for the formation of \(\mathrm{H}_{2} \mathrm{O}(\mathrm{g})\) from the elements is extremely large and that for the formation of \(\mathrm{NO}(\mathrm{g})\) from its elements is very small. This implies that (1) \(\mathrm{H}_{2} \mathrm{O}\) has a tendency to decompose into its elements. (2) NO has low tendency to decompose into its elements. (3) NO has appreciable tendency to decompose into its elements. (4) NO cannot be produced from direct reaction between nitrogen and oxygen.
Problem 47
Degrec of dissociation of weak acid and weak base are the same. If \(0.001 \mathrm{M}\) solution of weak acid has \(\mathrm{pII}=5.0\) then the pII of \(0.001 \mathrm{M}\) weak base is (1) 9 (2) 5 (3) 10 (4) 8
